Rotary pump.



0. SIEMEN.

ROTARY PUMP.

APPLICATION man APR. 15. ms.

Patented Feb. 13, 1917.

2 SHEETS-SHEET 1 0. SIEMEN.

ROTARY PUMP.

APPLICATION FILED APR. 15. m3.

1,215,81. Patented Feb. 13,1917.

2 SHEETS-SHEET 2.

a a \v 5 Z an erm ne- ATE T curios.

o'm'o sinner, or NONNENDAMM, 1mm BERLIN, GERMANY, assreuon ro SIEMENS- 'SGHUCKEBTWERKE, q. M. 3.3., or BERLIN, GERMANY, A ooaronarrou or GER- MANY.

To all whom it may concern. 1 a I Be it known that I, OTTO SIEMEN, a citizen ofthe German Empire, and residing at N onnendamm, near Berlin, Germany, have invented certain'new and useful Improvecasing. My present pump furthermore is characterized by the fact that the liquid to be conveyed does not simultaneously enter all blades of the wheel. Thus the latter will not be impinged rupon uniformly from all sides, but only at a part of its blades. In-

stead of the inlet openings which are distributed all over the periphery of the wheel,

therefore, individual openings will be em 'ployed which are positioned only at one side of'the pump at a point which is at 'a greatest possible distance from 'theoutlet opening, A characteristic feature of these pumps is thatthey are able to generate a much higher pressure than the ordinary pumps which are impinged uponuniformly from all sides. The reason for the increase of the pressure generated in the liquid is due to the fact that by the blade wheel there will be energy continuously conveyed to the liquid, thus causing an increase of pressure because the water on its way'fromth inletopenlng to the outlet opening cannot leak through at any point. As a matter fact pressure gages which are evenly distributed over the periphery of the casing will indicate a pressure which; is increasing toward the discharge opening. 'It is immaterial, as

far as the action of the pump is concerned,

whether the'ginlet openings for the-liquid are posltloned on the interior or exterior circumference of the blade wheel or on the side thereof. V v The pressure of the liquid to by the pump will be'increasing from the inlet openingof the casing toward the outlet openingnot only at the interior circumfercarried along with the blade wheel or which ence of the casing but in the entire liquid. ring as faras it enters the cells of the blade wheel.

, Thisincrease in pressurewill also be imparted tothe air which is eventually Specification of Letters Patent.

be conveyed rammed Feb. imam.

. Application filed Apri115, 1913. Serial No. 761,280.

is given ofli by the water, providedthat a certain minlmum pressure will be kept at the outlet. In order to obtain a definite pressure, the pressure conduit must be closed either bya water column, such as} is presentwhen. pumping into a container positioned at a high place, orby means of a valve WlllCh 1s 0 erated automatically or by hand.

The air belng the comparatively lighter me:-

dium will be kept at the bottom of the blade chambers, and after entering into the wheel it will first be compressed, thereupon again expand when passing the air-containing cells at the-inlet opening, whereupon it will again be compressed.

According tomy invention the pump of the aforedescribed type is so modified that the air when being heavily compressed in the blade wheel can discharge to the outside. By this the pump will be caused to become self-priming as a suction pump, that is it will be made suitable for conveying air.

. 'As known the conduits in rotary pumpsmust be filled before starting or the air must 'be sucked off from the same-by means of an especial, airpump. If during operation of the pump slight quantities of air be entering 1nto the suction conduit, which ai be due to leakageythe pump pressure ill be decreased "and the water column w1ll fall Ofl r ThQ fact that the operation of the pump is/easily affected by the entrance of air is found especially disagreeable in case of pumps which are controlled from a distance -or in case ofpumps having an automatic control for rendering the same operative or inoperative, in which class of pumps the water colu'mnyvill not falloff. Such a pump will then further, operate under no load and will be exposed to injury. In order to enable the discharge of air in the pump ac cording. to this invention special dlscharge openings areprovided at a point of the eas- L mg where the an 15 under a pressure higher than atmospheric.

M 'nv'entiona will be more fully underdfawings, in which Figure 1 shows a. crosssection through a pump vertical to the axle, Figs. 2, 3 and -lshow modified forms of my pump of the same cross section, in which an especial pressure is exerted upon the air 0. stood by reference to the accompanying sucked in, Fig. 5 a vertical section through thepump parallel to the ax1e,'in which'the blade wheel is tightened against the periphery of the inlet pipe by the water which .is subgected to pressure, Fig. 6 shows the construction of a known valve which may 5 preferably be employed for operating my pump, Fig. 7 a'section parallel to the axle of the pump having a water tank provided at the suction pipe,'so that the pump whenever it is started is automatically filled with '10 tightening water.

I As shown in Fig. 1 the casing is indicated by the letter a, the blade wheel by b, the out'-. let by the letter 0, the cylindrical space by d which spaceis limited by the fixed pipe 7- having the opening 6. G is the pipe for the inlet with which the suction pipe of the pump is connected. The valve 71 is arranged in,the outlet 0 or in the pressure conduit C. In one or both side walls of the casing on the ipe f there is.provided a discharge pi e H w h pump casing through the opening 9, at which opening a high'pressure wil be exerted uponthe air. This outlet opening 9 is connectedwith a channel I, in the pipe 7'. The operation of my present pump will be as follows :Before the first starting,'the pump must be filled with water and the pressure conduit must be closed. As soon; as the blade-wheel of the pump will be set in rotation the water within the pump will be thrown outwardly against the walls of the casing and by reason of centrifugal force will orm a liquid ring. The water can not 36 discharge through the outlet 0, because t e latter is closed up bythe valve 6 If air be .present in the suction conduit it will be carried away with the blade wheel andjremain fwithin the blade-chambers which are formed 40 air will be kept at the bottom of said bladechambers. On the way from the inlet opening e to theoutlet opening 9 the air will be more and more compressed. As soon as the 46 air-containing blade-chambers will pass the outlet opening 9, the air will bedischarged to the outside andthis'proc ess will continue until all present air is removed. Thereupon water will be discharged from the con 50 duit H. Now "the valve 2', inthe pressure conduit may be opened and the pump will now convey Water.

If. the pump during operation, that is if .valve'z', be open, has to overcome a less head than would correspondto the 'static' presis-gnerated by the transformation of ve- 5 'locity into pressure which takes place at 6Q the outlet opening or its-vicinity.

ich is connected with the interior of t e by the blades, and more particularly this The outlet'o, as shown in Fig. 2, is connected through the duct is with the casing of. the pump at that point at which the air shall be discharged. The place of entrance Z of the pipe is into the blade chamber may be 'at any desired distance in radial direction from the pump axis. This place of entrance the same as the place of entrance m of the pressure conduit is at the'pressure flange will be arranged according to the pressure conditions of the pump. It is essential that the inlet opening is arranged at least in a distance from thevertex A which is equal to the pitch of the blades, so that the chamber from whichthe air shall be discharged will be completely separated from the outlet. In this manner the-pressure can not equalize itself toward the outlet. The

, outlet opening for the air may also be placed in a'small radial distance near the circumferenceof the blade wheel in order to make the pressure exerted upon-the air as large as desired, or for this purpose also the pipe I f with the openinge may be made very large. If it is foundthat the conditions of the entrance of the water become unfavorable, in

the interior of the inlet pipe, an especial wheel I), may be arranged which is impinged upon from all side'andwhich will introduce the water under increased pressure and at increased velocity into the blade wheel 12,. The blade wheel which is impingednpon from all sides may be driven simultaneously with the main blade wheel or it may also be driven independently from the same.

. Fig. 3 shows another fgrm of the construction according to my invention. The spaces between the blades are divided into two sets ofspaces b and b, by a fixed ring concentric with the axis 'of the pump. Water is conveyed by means of the outer spaces, while air is conveyed in the inner spaces. The increased pressure by means of a pipe is connected to the branch pipe 0, so that the collected airis expelled. .7 r

upon the air according to the arrangement shown in Fig. 4 the vertex of the pump, that is the point at which'the blade wheel is in its greatest vicinity to the pump nor set of spaces '6 is placed'under an in-' In order to increase the pressure exerted casing, may be removed from the outlet 0 in I the direction of rotation. The point A of the casing at which the outlet branches ofl is then arranged'in a certain distance from the blade wheel, and a wedge-shaped space is 7 formed from this point A to the vertex B in which the water between blade wheel and casing is stowed and therewith subjected to an increased pressure.-

The outlet opening 9 is connected with thechamber which is'positioped in,the vi- 'cinity of the vertex B Where the greatest pressure takes place.

. g When the blades of the wheel are held at their two sides by walls the air collecting at the bases of the blades can pass through the narrow clearance between the side walls and the internal admission pipe, whereby losses of pressure are caused. In order to prevent the escape of the air the clearance between the admission pipe and the blade wheel can be subjected from the outside to a higher pressure. In Fig. 5' an arrangement for this purpose is represented. The blade wheel I) having the'twoside walls 2 is carried by the shaft w. In order to prevent the air issuing from the spaces between the blades through'the clearance t into the pump casing the clearance is placed under pressure by means of passages u, leading from a place of high pressure in the easing into the chambers between the side walls of the blade v wheel andthe wall of the casing.

In order to autoinatically operate the pump instead of an ordinary slide valve or a water column 1n the pressure condult a valve may be employed which automatically maintains in the pump that minimum pres-' sure which is suitable for the discharge of the air.

In Fig. 6a clearance device is shown in the form of a well known valve which is employed for thispurpose.

0 indicates the outlet of a pump according to a: construction as described; connected the surfaces will counteract each other, the

' According to my invention the packing ofv valve piston will be completely balanced and the pump will always work against the pressure which is determined by-the load imposed upon the valve piston 12. The same purpose is attained, if the surfaces f and f for instance in case of a cylindrical construction of the piston, become zero.

the pump can be made reliable by means of a device for automatically replacing the water which is thrown out of the pump. Fig. 7 showsan example of such a device which relates to an arrangement in which a pump is represented to which the medium to belifted is supplied internally. Gr' designates the suction pipe from which the water enters by way of theadmission branch pipe f through the inlet opening 6 into'the blade wheel (not shown) in the casing a. Only the one half-of the casing a is shown. Connected' to the suction pipev G is a tank D having upper and lower openings Z Z opening into the suction pipe; The tank D may be cast directly. on the pipe or, of

course, be separate therefrom, when connecting pipes will be provided instead. of the openings 2 and 1,.

This deviceoperates as follows :-Before the pump is first started'it is filled with water, when the pipe f and the tank Dare also filled. Wheneverthe pump is started subsequently the branch pipe f will first be emptied. When the air is then conveyed a portion of the water requisite for forming the packing ring of liquid is carried away. This is now automatically replaced, according to my invention, from the tank D as the water contained therein gradually flows out through the one opening I, or the connecting pipe between the tank D and the pipe 7'. The quantity of water which flows out of the tank D can be regulated as desired by an adjustable valve (notshown) at the opening Z As soon as the air has been removed from the suction pipe water begins to be lifted and the tank D fills again with water. The size of the tank D must, of

course, correspond to the quantity of air to be conveyed.

Having thus described my invention I claim as new and desire to secure by Letters Patent of the United States 1. A rotary liquid pump-comprising a casing, an inlet and an outlet therein, a blade wheel within said casing, said inlet being disposed at only one place of said blade wheel, and an additional opening provided at a point of said casing near the bottom of the blade chambers for carrying off the air collecting therein.

' 2. A rotary liquid pump comprising a easing, an inlet and an outlet therein, a blade wheel within said casing, said inlet being disposed at only one place of said blade wheel, an additional'opening provided at a.

point of said casing near the bottomof the blade chambers for carrying of! the air col- 1 lecting' therein, and a valve for temporarily closing said outlet during carrying'ofi' said air.

- 3. A rotary liquid pump comprising a cas ing, an inlet and an outlet therein, a blade wheel within said casing, said inlet being disposed at only one place of said blade wheel, and an additional opening provided at a point of said casing near the bottom of the blade chambers for carrying off the air collecting therein, said casing being of modified construction so as to produce an additional increase, of liquid pressure in a chamber of the blade wheel after passing of said outlet of the pump.

4. A rotary liquid pump comprising a casing, an inlet and an outlet therein, a blade wheel within said casing, said inlet being disposed at only one place of said,blade lade chambers forycarrying off the air colshaped space contractingin the direction of rotation, whereby an additional increase of liquid pressure Will be generated in a chamber of said blade Wheel after passage of said outlet.

5. A rotary liquid pump comprising 2. cas-' ing, an inlet and an outlet therein, a. blade Wheel Within said casing, said inlet being disposed at only one place of said; blade Wheel, an additional opening provided at a point of said casing near the bottom of the blade chambers for carrying off the air collecting therein, and an automatic valve inserted in the outlet of said pump for maintaining a certain minimum'pressure in said outlet. I

6. A rotary-liquid pum comprising a casing, an inlet and an out et therein, a blade Wheel Within said casing, said inletbeing disposed at only one place of said bladewheel, an additional opening provided at a point of said casing near the bottom of the blade chambers for carrying oil the air collecting therein, said casing beingdf modified construction so as to produce an additional increase of liquid 'pressure in a chamber of the blade Wheel after passage of said outlet, and an automatic valve inserted in the outlet of said pump for maintaininga certain minimumv pressure in said outlet.

7. A rotary liquid pump comprising a casing, an inlet and an outlettherein, a blade Wheel Within said casing, said inlet being disposed at only one place of said blade Wheel, an additional opening provided at a point of said casing near the bottom of the blade chambers for carrying otl'v the air collecting therein, a valve for temporarily closing said outlet during carrying off said air,

and an auxiliary tank provided near said I inlet for supplying the water which is necessary for starting the pump. In testimony whereof, I have signed my 'name. to this specification in the presence of two witnesses.

OTTO SIEMEN. Witnesses: HENRY HAsPER,

WoLDE'MAR HAUPT. 

